A day after a new twist in the mysterious death of his wife Sunanda Pushkar, Congress leader Shashi Tharoor on Wednesday demanded a quick probe into the case.

After questions were raised over his involvement in the case, Tharoor clarified that he has been backing a thorough probe into his wife’s death since the very beginning.

The Congress leader said he wants speedy inquiry for a "clear and definitive conclusion" over the cause of death of his wife.

Tharoor's issued a statement saying, "Upon the tragic loss of my wife Sunanda and from the very beginning, I have requested for a thorough investigation by the authorities to be conducted and concluded rapidly and transparently. The Pushkar family has taken the same view and we have all fully co-operated with the authorities. I reiterate my request to bring this protracted inquiry to a clear and definitive conclusion at the earliest, so as to put all speculation to rest."

Meanwhile, with a senior AIIMS forensic doctor reportedly alleging that he was pressurised to manipulate the autopsy report of Sunanda Pushkar, Delhi Police on Wednesday said it will “examine” him and former Union Minister Shashi Tharoor if needed.

“Whatever will happen in this case in the future I can’t tell you right now but want you to know that investigation in the case is going on. Whatever is necessary is being done. If it will be necessary to examine Dr Gupta, he will be,” said Delhi Police Commissioner BS Bassi.

“If it is necessary to take on record the affidavit which apparently has been filed by him before the Central Administrative Tribunal (CAT) that too will be taken into account,” he said.

“We will be conducting the enquiries keeping in view the legal position and relevance of the evidence. If it necessary to examine Tharoor then it will be done,” he said.

Sunanda was found dead in a 5-star hotel in South Delhi on the night of January 17, a day after her twitter spat with Pakistani journalist Mehr Tarar over an alleged affair with Tharoor.

Inquest proceedings under Section 174 CrPC were initiated in the Sunanda case according to which a sub-divisional magistrate inquires into the death of a woman if she dies within seven years of her marriage.

Delhi Police is investigating the case after the SDM asked them to probe it.

Gupta refused to comment on his reported allegation, saying he has already stated the facts before the “competent” authorities.

“I don’t want to comment on this issue. It is a legal matter, a serious issue, I cannot share with the media. I am a government servant. Whatever I wanted to say, I have said at a competent place,” he said.

Gupta, who was heading the panel that conducted Sunanda’s postmorterm, has reportedly alleged he was pressurised to show that her death was natural which he resisted.

The autopsy report had mentioned more than a dozen injury marks on Sunanda’s hands and an abrasion on her cheek which suggests a “use of blunt force”, besides a “deep teeth bite” on the edge of her left palm. Viscera samples were preserved after the autopsy at AIIMS and sent to CFSL for further tests.